Resin bonded FPDs

for students

1. Resin-BondedResin-Bonded FPDsFPDs
Prepared by: Benju Sharma Presented to: Dr Ankita Rathi
Roll no 35
Department of prosthodontics

2. •Introduction
•Introduce to minimize the main drawback of conventional
fixed partial dentures i.e destruction of sound tooth
structure.
•Development of acid etching of enamel to improve the
retention of resin led to the concept of resin bonded
FPDs.
•In these FPDs metal framework is like a wing attached to
the abutment teeth.

3. •Conventional FPDs
–Greater amount of sound
tooth destruction.
–Esthetically may not be
very pleasing
–Missing as well as
abutment teeth has to be
replaced.
•Resin bonded FPDs
–Adjacent tooth preparation
is minimal.
–Can be given in both
anterior and posterior
region because of its
pleasing esthetics.
–Only the missing tooth is
to be replaced.

4. •Types of resin bonded FPDs
1.Rochette bridge
2.Maryland bridge
3.Cast mesh fixed partial denture
4.Virginia bridge

5. 1.Rochette bridge
•Have funnel shaped perforations in the wings to
enhance retention.
•Combined silane coupling agent to produce adhesion to
the metal.

6. 2. Maryland bridge
•Adapted electrochemical pit corroding technique.
•3.5 % soln of nitric acid for 5 minutes with current of 250
mA/crn^2 followed by immersion 18% hydrochloric acid
soln in a ultrasonic cleaner for 10 minutes.
•Resin-alloy bond strength of 27.3 MPa.
•Specific to nonberyllium nickel-chromium alloy.
•2.9 times more retentive than perforated type.

7. •Technique sensitive, overetching produces electro
polished surface.
•Other surface treatment techniques are;
Nonelectrolytic technique of placing a nickel-chromium-
baryllium alloy in etching solution in a waterbath for an
hour.
Combination of etching with silane.
Air abrading metal to increase bonding strength.

8. 3. Cast mesh fixed partial denture
•Nonetching method
•A net-like nylon mesh is placed over the lingual surfaces
of abutment teeth in the cast the mesh is incorporated in
the retainer wax pattern.
•If the mesh blocked out by wax when investing retention
will be compromised.

9. 4. Virginia bridge
•Incorporation of salt crystals into retainers to produce
roughness in inner surface called as lost salt technique.
•Retainer pattern fabricated with resin with 1mm wide
crystal free zone around the outline.
•The salt is dissolved in water after the resin polymerizes,
cubic voids act as the retentive component.
•Aluminum oxide use as surface treatment to improve
bonding with resin.

11. Resin cement
–First bonded restorations used unfilled resin for
retention.
–Unfilled or filled resins were used with perforated
retainers
–Thin film thickness resins were then introduced for
luting resin bonded FPDs
–Then the chemically active resin cements were
introduced they could adhere to metal surface
producing retention.
–Tin plated metal alloy had better bonding with
chemically active resins, air abrasion with aluminum
oxide particles was also employed.

12. Advantages
–No local anesthetic required because most tooth
preparation involves enamel.
–Supragingival margins.
–Minimal tooth preparation required
–Can be rebounded if the axial adhesion get loose.

13. Disadvantages
–Some amount of sound tooth structure has to be
lost.
–Questionable longevity
–No alignment correction is possible.
–A provisional prosthesis cannot be fabricated.

14. Indications
–Caries free abutment teeth
–Mandibular incisor replacement
–Maxillary incisors replacement
–Periodontally compromised abutment with
reinforcement of resistance features while preparing
the tooth.
–Single posterior tooth replacement.

15. Contraindications
–Extensive caries
–Nickel sensitivity
–Deep vertical overbite

16. Tooth preparation
–Axial reduction and guide plane on proximal surface
with slight extension onto the facial surface
providing faciolingual lock.
–Light chamfer finish line 1mm supragingivally.
–To enhance resistance 180 degree tooth
preparation is to be done.

18. –Large surface area is involved to improve bonding.
–Occlusal clearance sometimes employed.
–Vertical stops are placed like flat countersinks on
lingual surface of incisors, cingulum rest on canine,
occlual rest seat on premolars and molars.
–Grooves are used near the facioproximal line angle
and opposite side of cingulam or lingual cusp
creating a wrap around effect.
–For mandibular premolars full coverage of lingual
cusp is done .

19. –Molars also have lingual cusp coverage
preparation, inlays can be attached to anatomical
groves on distolingual surface, axial coverage
extending through proximal contact to connect with
occlusal rests.

20. •Armentarium
–High speed hand piece
–Articulating ribbon
–Small wheel and short needle diamond bur
–Flat-end and round-end tapered diamond bur.

22. •Reference
•Fundamentals of pixed partial prosthodontics by
Harbert T.Shillingburg
•Internet